I highly disagree with this suggestion. Everything has it's counters, including lex aetherna and stone curse. Why should those only be disabled for one class? Just because asura can one hit someone that's lexed or stoned?
Any good pvper will be immune to stone curse. And if you insist on wearing gear to boost your damage even higher and give up on that immunity then that's your choice, but don't use it as an excuse to indirectly nerf a class. Over time other classes have received major buffs (through valk weapons and rings) while all champ buffs remained very low and limited. I don't feel like champs need any nerfs at all, they're certainly possible to deal with and are (imo) one of the best balanced classes on the server.
Of course there is counterplay. It's called gearswapping and it's very essential in a pvp server such as this one. Double OL armor? Alice shield on top maybe? or the other way around, changing to double deviant, switching boots to double ferus/GEC/AF. All ya need to do is survive the one hit he does. Or stay on range ? or use sinx card and force him to uncloak you with ruwach = lex gone. There's a lot of things you can do to counter it/ fight against it.